<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="selectAll"/>
    </label>
    <span> <span>已完成{{completeSize}}</span> / 全部 {{todos.length}}</span>
    <button class="btn btn-danger" @click="clearCompleteTodos">清除已完成任务</button>
  </div>
</template>

<script setup lang="ts">
import { computed } from '@vue/reactivity';
import type { Todos } from '../types';

  // Props的类型结构
  interface Props {
    todos: Todos;
    checkAll: (isCheck: boolean) => void;
    clearCompleteTodos: () => void
  }

  const props = defineProps<Props>()

  const completeSize = computed(() => props.todos.reduce((pre, todo) => pre + (todo.complete ? 1 : 0), 0))

  const selectAll = computed<boolean>({
    get () {
      return props.todos.length===completeSize.value && completeSize.value>0
    },

    set (value) {
      props.checkAll(value)
    }
  })
</script>

<style scoped>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}

</style>
